Gamma Xaridian, a peaceful Federation research Colony that becomes the third Federation world to suffer a brutal attack at the hands of a mysterious alien fleet. With lieutenant or gone on an important mission of her own, Captain Kirk in the USS Enterprise are dispatched to investigate the tax, only to find the planets completely devastated. When another nearby colony is attacked, the USS Enterprise is ready and encounters a fleet of quick, small and deadly ships. Kirk and his crew managed to turn the Raiders away, the USS Enterprise is severely damaged in the aliens escape. As Kirk and the crew prepare for their next encounter with the raiders, Mr Spock makes a Starlin discovery about the purpose behind the alien attacks, a purpose that, if realized, could have deadly consequences for the Federation in the USS Enterprise.